Gemini iris 180l rear lightwith 180 lumens the incredibly small yet powerful gemini iris led rear light will let other road users know exactly where you are allowing you to ride your bike with confidence use the seatpost mount with an o ring attachment to quickly mount the gemini iris to your bike or opt for the clip mount to secure it to your backpack the gemini iris is powered by a high capacity lithium ion battery a quick 90 minutes of charging through a usb port will get you up and g